Thermostatic control for carbureters.



KLENGLAND.

THERMOSTATIO CONTROL FOR CARBURETERS. I

APPLICATION FILED FEB. 1|. 1915.

2 SHEETS-SHEET 1'- WVENTOW Pzitented Dem 12,1916.

" A. E. ENGLAND.

THERMOSTATIC CONTROL FOR CARBUBETERS. I

' APPLICATION FILED FEB. 11. 1915.

Patented! Dec. 12, 11916.

2 SHIEETSSHEET 2.

- To ENmNvL-T WATER COOLING SYSTEM WATER CooLlN e.

Y$TEM INVENTOIR HTTORN E! T T TEN ABTHUR E. ENGLAND, 013 DETROIT,MICHIGAN.

i THEBMOSTATIC CONTROL FORCARBURETES.

Specification of Letters Patent. Paytqgntqgdl Deng, 1L2, 119105Application filed February 11, 1915. SeriaINo. 7,507.

ToaZZ whom it may concern Be it known that ll, ARTHUR E. ENGLAND, acitizen of the United States, residin at Detroit, county of 'Wayne,State of Michigan, have invented a certain new and useful Improvement inThermostatic Control .for Carburetors, and declare the following to be afull, clear, and exact description of the same, such as will enableothers skilled in the art to which it pertains to make and use the same,reference being had to the accompanying drawings, which form a part ofthis specification.

This invention relates to a thermostatic control of the needle valve ofa carbureter. It is intended as an improvement on my previousapplication which covers broadly means *for utilizing the engine coolingwater to stimulate the action of the thermostatic member. i

In my present invention the thermostatic element is quite differentlylocated with respect to the carbureter and operates in a dif: ferentmanner than in the structure of my previous application. This will morefully appear in the description following.

In the drawings,-Figure l is a side view of the carbureter, the floatchamber being broken, away to show the interior construction. Fig. 2 isa vertical section through the carburetor and the thermostatic member.

The carbureter shell is designated a, the auxiliary air valve 6, themain air gate a, the

throttle valve (Z, the fuel nozzle 0, the needle valve 7, the float gand the float valve it. These are standard construction and as they areno particular part of my invention further description is not required.

The coil spring 1; bearing against the collar j on the end of the needlevalve tends to pull the pointof the needle out of the. orifice in thenozzle e, or in other words to open the, needle valve to fullposition.This is counteracted by the action of the rocker bar is pivoted to thelower end of the thermo static bracket Z. This thermostatic bracket isscrewed to the carbureter shell by the screws shown in Fig. l and thethermostatic tube on is held to the thermostatic bracket 1 by means ofthe clips n and 0. The clip n has a tight while the clip 0 has a loosefit. The engine cooling water enters through the l er n pple p, travelsp through the tube and out the elbow g. The tube is preferably a brasstube which has a high coefficient of expansibility.

' The operation is as follows: When the engine has/been standing withoutworking, the engine water of course becomes cool and the thermostatictube is contracted, opening up the needle valve so that a full jetoffuel can issue through the nozzle. It is atthis time when the engineis cool that starting is hard and a rich mixture is required. As soon asthe engine heats up the water is heated and this heat is immediatelyconveyed to the thermostatic tube which expands, depressing one end ofthe rocker 1 and raising the other end. The raising of the latter end ofthe rocker arm causes the needle valve to approach its seat and reduces.the fuel jet to a point sufficient to give an adequate amount of fuelfor the work, but restricting the initial amount which is now notrequired. It will be seen, therefore, that the thermostatic memberadjusts the needle valve automatically so as to care for the enginesneeds. The thermostatic member also automatically takes care of thelarger fuel needs of starting in cold weather, for the reason thatthere'is a greater contraction of the thermostatic member in coldweather,

as the engine water is of course colder from. p

The thermostat standing in cold weather. also adjusts itself to theprecise fuel needs of the engine when heated up, whether the weather ishot or cold, as it is apparent that the engineheat rather than the heatof the weather adjusts the fuel supply after the the point where thethermostatic tube con-' tacts the rocker bar to the fulcrum point of therocker bar, is less than one-half the distance from the fulcrum point tothe set screw on the-other end of the rocker bar which contacts with theneedle valve. Consequently the movement of the thermostatic Any ratio ofmultiplica-- tube is practically multiplied by two and I one half whencommunicated to the needle valve. Inasmuch as the expansion of athermostatic member is rather small, being in the thonsandths of aninch. it is apparent that this multiplication secures a greatervariation in the movement of the needle valve than would otherwise bepossible.

The set screw r is for the purpose of adjusting the thermostaticapparatus and the needle valve to the needs of the particular engineupon which it is mounted.

What I claim is 1. In av device of the character described, thecombination of a carbureter shell, a needle valve normally tending awayfrom the needle valve seat, a thermostatic tube secured to the shell ofthe carbureter in substantially parallel relation with the needle valveand arranged for connection with the water circulating system of theengine jackets, and a rocker arm= pivotally supported on the shell andhaving one end with a thrust engagement with the needle valve and theother end with a thrust engagement with the thermostatic tube.substantially as described.

2. In a device of the character described, the combination of acarbureter shell. a needle valve. a spring normally tending to unseatthe needle valve. a thermostatic tube tube opposite the end which issecured to -A the carbureter shell.

In testimony whereof. I sign this specification 111 the presence of twowitnesses.

ARTHUR E. ENGLAND.

Witnesses STUART C. Banxrs, VIRGINIA C. SPRATT.

